2) Is a Piezo Injector, these have a very high resistance but a very low Capacitance ( usually approx 0.0035 of a Farad) and can be checked with a suitable meter/testbench. 
on August 31, 2010, 9:49 am, in reply to "Re: citroen berlingo 20 hdi engine light came on and customer found it hard to start, we checked codes "
In general terms there are two types of injector fitted to the modern CR diesel engine.
1) Is a solenoid operated injector, these have a very low internal Resistance (usually under 0.4 of one Ohm) and can be checked using an Ohms meter.
Your Injection system should be fitted with Piezo injectors and this is what Steve is pointing at. HTH
Regards Mark
Modern cars, Its all wizardry and witchcraft
